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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dfcb81b32d9aa2b45b3caccd3d432750787b6021d9660f16dac6b82bb174be' 
  AND token = 'Gq7wKyGEUsrkrbuXSM5jYIMWhF/R1x0mGSu4Z/c8Sx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}